Icosikaiheptagonal Number | C # program to find N - th icosikaiheptagonal number ; Function to find the nth icosikaiheptagonal number ; Driver code
using System ; class GFG { static int icosikaiheptagonal ( int n ) { return ( 25 * n * n - 23 * n ) / 2 ; } public static void Main ( String [ ] args ) { int n = 3 ; Console . Write ( "3rd ▁ icosikaiheptagonal ▁ Number ▁ is ▁ " + icosikaiheptagonal ( n ) ) ; } }